Water subduction processes constrained by halogens and noble gases in the Sanbagawa metamorphic rocks

Abstract

The ubiquitous occurrence of sedimentary-pore-fluid-like halogens and noble gases in metamorphic rocks from the Sanbagawa belt is best explained by a model where water with a pore-fluid signature is incorporated into subducting oceanic lithosphere as serpentine along fracture zones developed at the outer rise and released to the mantle wedge associated with the serpentine dehydration without significant modification in the halogen and noble gas compositions.